76 lines
1.3 KiB
C
76 lines
1.3 KiB
C
// See LICENSE for license details.
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#include <stdarg.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include "kprintf.h"
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static inline void _kputs(const char *s)
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{
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char c;
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for (; (c = *s) != '\0'; s++)
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kputc(c);
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}
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void kputs(const char *s)
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{
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_kputs(s);
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kputc('\r');
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kputc('\n');
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}
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void kprintf(const char *fmt, ...)
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{
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va_list vl;
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bool is_format, is_long, is_char;
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char c;
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va_start(vl, fmt);
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is_format = false;
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is_long = false;
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is_char = false;
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while ((c = *fmt++) != '\0') {
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if (is_format) {
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switch (c) {
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case 'l':
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is_long = true;
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continue;
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case 'h':
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is_char = true;
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continue;
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case 'x': {
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unsigned long n;
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long i;
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if (is_long) {
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n = va_arg(vl, unsigned long);
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i = (sizeof(unsigned long) << 3) - 4;
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} else {
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n = va_arg(vl, unsigned int);
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i = is_char ? 4 : (sizeof(unsigned int) << 3) - 4;
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}
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for (; i >= 0; i -= 4) {
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long d;
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d = (n >> i) & 0xF;
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kputc(d < 10 ? '0' + d : 'a' + d - 10);
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}
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break;
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}
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case 's':
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_kputs(va_arg(vl, const char *));
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break;
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case 'c':
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kputc(va_arg(vl, int));
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break;
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}
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is_format = false;
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is_long = false;
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is_char = false;
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} else if (c == '%') {
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is_format = true;
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} else {
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kputc(c);
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}
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}
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va_end(vl);
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}
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